Grinding-wheel-spindle-reciprocating mechanism



May 18 1926. 1,584,717

A. G. BELDEN E1- AL GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM Filed-Deo. so, 1922 KLJ. 0L. SM Carl G. F ly'qare Patented May 18,1926.

UNITED 'STATES PATENT orFlcE.

ALBERT G. IBELDEN AND CARL FLYGARE, OF WORCESTER; MASSACHUSETTS, AS- SIGNOIBSTO NORTON BOMPANY, 0F WORCESTER, MASSACHUSETTS, A CORPORA- TION F MASSACHUSETTS.

' GRINDINGfWHEEL-SPINDLE-RECIRROCATING;MECHANISM.

Application led December 30,'1922. Serial No. 609,914..A

Our invention relatesto grinding machines andD more particularly to a echanism for reciprocating the grinding W eel during rotation thereof. In grinding operations which require a straight-in feed of the wheel, there is a tendency for the abrasive grains of the wheel to form parallel marks on the work; hence in grinding even very short pieces of work it has heretofore been customary for the operator to mount the work on-a reciprocable table and to traverse the work back and forth relative to the wheel, in order to give the work a finished and polished surface. This requires'm'oving a rheavy work table through a short stroke and the table must be reversed in direction in a very short interval of time, thus tending to cause a shock and so 'vibrate the'work and produce 20 chatter marks thereon. This of course necessitates reciprocating the table at a sufliciently slow` speed to prevent such shock and vibration, and so limits the maximum production of the machine.

It has Abeen found feasible to move the wheel instead of the heavy work table in order to eliminate objectionable markings on f the work and it is accordingly an object of our invention to provide a simplified construction for reciprocating the` lgrinding wheel 'axially land so make it feasiblejo use a wide faced wheel and grind work without reciprocating its supporting table.

It is a further object of our/ inventionto provide a selective mechanism which may be 'set to oscillate the wheel when an in-feed cut is to be produced or be fixed rigidly to grind without reciprocation in accordancewith the usual method o f grinding. With these and further objectsas will be apparent in the following disclosure our in` vention residesin the combination of parts set 'forth in thespecification and covered by the claims appended hereto.

In the drawings in which like reference numerals indicate like parts: x Fig. 1 isa fron/televation partly broken oaway of a grinding wheel slide embodying our invention;

Fig. 2 is an enlarged fragmentary top plan view partly broken away of the end of the spindle housing showing the oscillating mechanism Fig. 3 is an enlargedsectional view lon the line 3--3 of Figure 1; v

Figa 4 is a fragmentary plan'view showing the relation of the work, its Supporting centers and the grinding wheel and the line 5-5 of Fig. 3.

This mechanism is applicable to grinding machines of various-types of construction,

and has been illustrated as applied particularly to a machine such as covered bythe prior patent to Norton #762,838, dated June 14,' 1904. As shown in the drawings, we mount the grinding wheel 10 on a wheel spindle 11 which is in turn carried in ,suitable bearings 12, adapted to take the radial thrust. These bearings are supported on the usual wheel slide 13 and the wheel spindle may be driven by a belt 14: and pulley 15, which may be connected with any suitable source of power.

In accordance with our invention we propose to provide a spindle reciprocating mechanism which is driven automatically by the rotating spindle itself and so make it unnecessary to bring in an outside power connection for this purpose. We also provide a manually controllable device for throwing this mechanism into and out of operative relation and we so construct and arrange these parts that they may be attached to grinding machinesof standard construetion. Y

In the specific embodiment shown in the drawing we have illustrated va simplied grinding wheel spindle construction in which the spindle 11 is provided with areduced end portion 20, which isscrew threaded for at-v tachment to our special reciprocating mechanism. In case'this reciprocating device is not required, this threaded extended portion may be yemployed in the usual manner for receiving the end thrust; hence, the ordinary wheel spindle construction may be employed merely by removing the collars and flange portion` adaptedto receive the end thrust and attaching to the wheel spindle slide the Fig. 5 is a fragmentary sectional viewon Y special housing 22 carrying my mechanism, wlnch 1s made 1n two parts for convenience in assembling.

In order to reciprocate the shaft wer provide-a worm 23 mounted on'the shaftawhich meshes with a worm gear 24=and by means of an eccentric 25, mounted on the worm gear shaft 26, we convey the reciprocating motion through a pivoted crank arm 27, which is connected to the worm 23 through rollers 28, riding in an annular groove 29 on the end of the worm. The worm 23 is attached to the spindle by an internally threaded portion 30, which is so threaded that the normal rotation of the wheel tends to tighten the worm on its spindle support. The shaft 26 carries the worm gear 24 and is mounted in suitable bearings carried by opposite portions of the housing 22. The eccentric or cam 25 is mounted rigidly on the shaft 26 to rotate with the gear and may be either circular in shape and eccentrically mounted as shown or of any desired cam shape to produce a reciprocating motion of proper characteristics. c

The crank arm 27, as shown in Fig. 3, comprises a U-shaped member and surrounds the end portion of the worm member 23. This member is pivotally mounted on the shaft 32, which is carried by opposite portions of the housing 22. One arm of the U-shaped member projects below the shaft 32 and has an inwardly extending portion 33, which has a face adapted to ride on the surface of the eccentric or cam 25. This face of the cam follower 33 is held in contact with the cam or eccentric at all times by means of a spring 34, which is held under compression between the housing 22 and the bottom of a depression 35 in the rear side of the extending arm 33. The end of the worm member is provided with ytwo flanges which form between them the groove 29. 'Ihe rolls 28, which ride in this groove and serve to transmit une reciprocating motion to the shaft are mounted on plins 36, which project inwardly fromv the -sha ed arm 27. A. roll is provided on each side of the grooved member, as shown particularly in Fig. 3.

A manually controllable device is provided for moving the cam follower away from the cam and holding it there so that the grinding wheel may not reciprocate but may be used in its normal grinding manner. To this end we provide the U-shaped arm 27 with a bevelled member 40, projecting outwardly therefrom and adapted to engage a similar cam or bevelled member 41. This cam member 41 is formed on the end of a crank arm 42, which rojects utpwardly from a shaft 43, pivotaly mounte ,in the end of the housing 22. The shaft may be rotated by a handle-44, projecting therefrom exteriorly of the housing. It will, therefore, be seen that,by means of this construction we may rotate the handle 44 to engage the cam faced members 40 and 41 and thus rock the U-shaped arm 27 and so remove the depending arm 33 from contactv with the eccentric or cam 25.

.As shown particularly in Figure 4, we mount the work in the usual manner on centers carried by headstock 48 and tailstock 49.V If the work has a reduced portion 50, anked by a shoulder, which is to be ground, we employ a wheel of such a size that the width of wheel plus the distance of reciprocation will fully cover the area to be ground.

The operation of this device is obvious from the above disclosure, it being clear that the rotation of the spindle transmits rotary m'otion to the worm gear and a rocking motion to the U-shaped member 27, which through the rollers 28 reciprocates the spindle along its axial line as the grinding wheel is rotated. This reciprocation ordinarily is so small that no special provision need be made for transmitting power through the belt 14 to the movable spindle. If it is desired to use the machine without reciprocating the spindle, a simple movement of the camV follower locking device serves to remove the follower 33 from a position where the cam can touch it. Thereafter the spindle is held by the locking device and all endwise movement is prevented.

Having thus described our invention, what we claim as new anddesire to secure by Letters Patent is:

1. A grinding machine comprising a rotatable wheel spindle Vmounted for axial movement thereon, a grinding wheel on said spindle, a rotatable cam, power mechanism to rotate the cam, a cam follower operatively connected with the spindle to reciprocate the same in accordance with the cam movement and manually operable means to remove the follower from the path of the cam and prevent reciprocation of the spindle.

2. A grinding machine comprising a base,

ka. rotatable spindle mounted in radial bearings thereon, a grinding wheel on the spindle, a rotatable cam, a cam follower moved by` the cam which is operatively connected with the spindle to reciprocate the same, means to rotate the cam and a manually controlled device to prevent axial movement of the spindle during rotation of the cam.

3. A grinding machine comprising a base, a rotatable grindin wheel spindle mounted thereon, a rotatab e cam, a cam follower operativel connected to reciprocate the spindle uring rotation thereof, direct power connections from the spindle to the cam and a locking device to hold the spindle axially immovable.

4. A. grinding machine comprising radial bearingsmounted thereon, a grinding wheel spindle axially movable in said bearindgs, means to rotate the grinding wheel spin e, a slow motion mechanism, connections be- Itween said mechanism and spindle to reciprocate the spindle axially,- ower connections between the spindle an said mechanism to operate. the latter, and manually operable means to break said connections and prevent axial movement of the wheel spindle.

5. A grinding machine comprising a rotatable wheel spindle mounted for axial movement thereon, a grinding wheel on said spindle, a rotatable cam mounted independently of the spindle, power connections from the spindle to rotate the cam, a cam follower operatively connected with the spindle rto reciprocate the spindle axially in accordance with the cam movement, and manually operable means to hold the follower out of contact with the cam and prevent reciprocation of the wheel spindle.

7 6. A grinding machine comprising radial bearings mounted thereon, a rotatable wheel spindle axially movable in said bearing, a grinding wheel on the spindle, a rotatable cam mounted independently .ofthe spindle, a cam follower, a member connected thereto to transmit theccam follower movement to the spindle, an end thrust bearingy between said member and spindle, and means to hold the end thrust bearing in a fixed position and prevent reciprocation of the wheel y spindle.

7. A finding machine comprising a base,

a rotata le grinding wheel spindle mounted thereon for axial movement, means to rotate. said spindle, a rotatable cam, a slow motion mechanism to rotate the cam, a lever pivotally mounted in the base, a follower on one lower from the path of the cam to prevent reciprocation of the spindle.

Signed at Worcester, Massachusetts, this 29th day' of Dec., 1922.

ALBERTG. BELDEN. CARL G. FLYGARE. 

